CSS anchor positioning is a new native CSS feature that allows elements like tooltips, popovers, and dropdown menus to automatically stick to other elements without JavaScript. Using properties like anchor-name, position-anchor, and position-area, developers can create a 3×3 grid positioning system around anchor elements. The feature includes smart fallbacks that automatically reposition elements when space is limited, and works with the anchor() function for precise control. Currently supported in Chrome 125+ and Edge, with a polyfill available for older browsers. This approach is faster, simpler, and more reliable than JavaScript-based positioning solutions.